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[[Image:MudCrab.jpg|thumb|300px]]'''Crabs''' are a large family of [[decapod]] [[crustacean]]s. There are hundreds of [[species]], mainly [[marine]], although [[freshwater]] species such as the [[Chinese]] [[mitten crab]], and land-dwelling species such as the [[robber crab]] (which climbs [[coconut]] trees to feed on the [[nut]]s), also exist.

[[Image:SallyLightfootCrab.jpg|right|thumb|300px|Sally Lightfoot crab]]

'''Crabs''' are a large family of [[decapod]] [[crustacean]]s. There are hundreds of [[species]], mainly [[marine]], although [[freshwater]] species such as the [[Chinese]] [[mitten crab]], and land-dwelling species such as the [[robber crab]] (which climbs [[coconut]] trees to feed on the [[nut]]s), also exist.

The [[Alaska]]n [[king crab]] is the heaviest species of crab, but the [[Japan]]ese [[spider crab]] has much longer legs, sometimes spanning ten feet or more. The smallest species of crabs are the [[pea crab]]s, that live as [[commensal]]s inside the shells of many [[bivalve]] [[mollusc]]s.

The [[Alaska]]n [[king crab]] is the heaviest species of crab, but the [[Japan]]ese [[spider crab]] has much longer legs, sometimes spanning ten feet or more. The smallest species of crabs are the [[pea crab]]s, that live as [[commensal]]s inside the shells of many [[bivalve]] [[mollusc]]s.

[[Image:SallyLightfootCrab.jpg|thumb|left|200px|Sally Lightfoot crab]]Crabs are typically [[omnivorous]], feeding primarily on [[algae]], but happy to scavenge or capture live prey when available. Crabs are themselves the common prey of many marine [[organism]]s, including [[cod]], [[cuttlefish]] and [[octopus]]es.

Crabs are typically [[omnivorous]], feeding primarily on [[algae]], but happy to scavenge or capture live prey when available. Crabs are themselves the common prey of many marine [[organism]]s, including [[cod]], [[cuttlefish]] and [[octopus]]es.

Crabs are an important fishery in many parts of the world.

Crabs are an important fishery in many parts of the world.